Yeah I think it’s possible, but it would depend on like… what NGriff’s emotions even are I guess. If like you suggest he has residual feelings for Guts because they were so life-alteringly strong when he was a human and Guts survived the sacrifice, then his capacity to care enough about anyone else to feel remorse is probably long gone. similarly if it’s just the fetus fucking with him then guilt and remorse is probably totally out of the picture.
I’m really into the idea of NGriff having a full range of unfrozen emotions and just completely repressing them tho. like, if human griffith justified his dirty/cruel actions to himself by telling himself that it would be worth it and he’ll be validated by fate when he achieves his goal (which i think he did but i’m not going to get into it rn bc that’s an upcoming post), then neogriffith can double down on that because he has achieved his goal now and has basically had his entire life and all his actions validated directly by god lol
so even if part of himself has woken up or w/e and is there with his beating heart feeling actual emotions and being horrified at what he’s become, it’d be really easy for him to deny/ignore those feelings because he has divine right, his life was/is dictated by fate and god itself told him everything he does is exactly what’s meant to happen, and therefore he has no reason to feel guilty for anything ever
which has the potential to be a really interesting internal struggle in theory. in practice the fact that the guilt-worthy subject is rape really like, sours it for me lbr, i can only cringe at the prospect of Miura addressing it in the future, but welcome to berserk i guess.
Also if I was going to make a guess about what’s most likely to happen in actual canon, I’d say that NGriff is probably never going to express actual remorse for anything though there may be subtle hints of inner conflict. give or take how much or how little of his feelings end up genuinely being attributed to the patron saint of lazy writing, the fetus.